Greubel Forsey GMT Balancier Convexe

With the new GMT Balancier Convexe, Greubel Forsey places the Earth back at the centre of its universe.

This new GMT calibre replaces all previous GMT models and features, for the first time, its signature inclined balance wheel, as if in orbit around the Earth.

Greubel Forsey GMT Balancier Convexe

The perfect titanium sphere with its continents, seas and oceans, is one of the Atelier’s most emblematic creations. It was the centrepiece of the GMT, GMT Earth, GMT Quadruple Tourbillon and GMT Sport, some of Greubel Forsey’s greatest successes to date.

Today, Greubel Forsey is dedicating a brand new calibre to the Terrestrial globe, decisively replacing its predecessors. It is the purest and most contemporary interpretation of the GMT complication ever imagined, deeply rooted in the universe of the brand as well as in Haute Horlogerie.

Greubel Forsey GMT Balancier Convexe

The Earth is showcased majestically, positioned at the very heart of an amphitheatre-like construction. Flush with the sapphire crystal, almost close enough to the surface to touch, it moves in a constant 24-hour rotation, just as the Earth rotates in real life. This amphitheatre is bordered by three rings which indicate two complementary times: hours and minutes local time, as well as universal time.

Greubel Forsey GMT Balancier Convexe

The 24 time zones displaying universal time are set against a black background if the time indicated is at night, and on a white background during the day time.

Local time is indicated on the two outer rings: one for the hours on a grey satin-finished ring, and minutes on a thin black outer ring. Each time indication has its own hand with a red triangular tip filled with luminescent material. These hands move on two further rings, engraved with key words dear to the Atelier, to display GMT. Finally, an off-centre display at 10 o’clock indicates a second time zone with a blue gold hand.

Greubel Forsey GMT Balancier Convexe

For the caseback of the timepiece, Greubel Forsey opted to keep the disc with 24 time zones indicating the UTC time of the 24 reference cities, but with a rather appropriate modification: the UTC of Paris has been replaced by the city where Greubel Forsey has been established since its early days: La Chaux-de-Fonds, Switzerland.

The 30° inclined balance wheel, seemingly suspended in mid-air, is held by a beautiful flat black polished and barrel polished steel balance wheel bridge on polished steel pillars. To its right, the small seconds, displayed with a blue gold hand completes the ensemble.

Greubel Forsey GMT Balancier Convexe

The titanium bridges are hand-finished with a steel brush and take on a frosted texture never before applied by Greubel Forsey. The delicate frosted surfaces catch the light and accentuate the globe, which remains the protagonist of the arena.

Finally, the inside of the case is polished so that it mirrors the escapement platform, the Terrestrial globe, and nearly every element visible on the dial side, thus adding incredible depth to this new construction.

Greubel Forsey GMT Balancier Convexe

Designed by Greubel Forsey, the signature convex case measures 46.5mm around the bezel and 43.5mm around the case-band. Made of in titanium, it hugs the curve of the wrist perfectly. The sapphire crystal and satin-finished bezel follow the same curved geometry, which extends onto either a titanium bracelet or a textured rubber strap.

The Greubel Forsey GMT Balancier Convexe is limited to 66 timepieces: 22 per year between 2022 and 2024.

Technical details

Model: Greubel Forsey GMT Balancier Convexe in Titanium

Movement
Patented hand-wound movement
Olived-domed jewels in gold chatons
30° inclined Greubel Forsey balance wheel system
Power reserve: 72 hours
Frequency: 21’600 vibrations/hour

Number of parts
Movement: 423
Escapement platform: 59
Number of jewels: 42

Displays
Hours and minutes
Small seconds
2nd time zone GMT
Rotating globe with universal time
Day-and-night
24 time zones universal time
Summer time, winter time

Case
Titanium with curved sapphire crystal
Three-dimensional, variable geometry-shaped bezel, hand-polished with hand-finished straight graining
Raised engraving “GMT” and “Greubel Forsey”
Diameter: 43,50mm (caseband) and 46,50mm (bezel)
Height: 13.75mm (case) and 17.40mm (including synthetic sapphire crystals)
Water-resistance: 10atm – 100m – 328ft

Dial
Terrestrial globe in titanium, relief-engraved continents, ocean blue treatment
Day-and-night UTC indicator in titanium, engraved and lacquered
GMT indicator in gold
Amphitheatre hour-ring with engraved and lacquered minute-circle
Small seconds indicator in gold

Strap
Non-animal material, rubber with text in relief, titanium folding clasp, engraved GF logo
On demand: 3-row metal bracelet in titanium, folding clasp with integrated fine adjustment, engraved GF logo